Piezoelectricity in poled hydroxyapatite ceramics

Abbasi A. Gandhi, Maciek Wojtas, Sidney B. Lang, Andrei L. Kholkin, Syed A.M. Tofail

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

Direct current electrical poling of textured hydroxyapatite (HAp) ceramics is reported here to exhibit weak ferroelectricity and pyroelectricity, but a remarkably higher (six orders of magnitude) piezoelectricity. The piezoelectric strain coefficient is an order higher than that of bone and of the same order as that of quartz crystal and uncalcified collagen in tendon. The piezoelectric charge coefficient is an order higher than bone, and three orders higher than that of tendon. Piezoelectric constants of poled HAp ceramics are high enough to have physiological relevance such as in the use of bone grafts for stimulated calcification or in energy harvesting from physiological motions. Piezoelectricity in these ceramics can be tuned by controlling texture, and poling parameters. The density of power that can be harvested from HAp ceramics is currently just one order lower than biocompatible ferroelectric ceramic such as barium titanate.

Original languageEnglish
Pages (from-to)2867-2872
Number of pages6
JournalJournal of the American Ceramic Society
Volume97
Issue number9
DOIs
StatePublished - 1 Sep 2014

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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